<?php
/**
 * "Context" diff renderer.
 *
 * This class renders the diff in classic "context diff" format.
 *
 * $Horde: framework/Text_Diff/Diff/Renderer/context.php,v 1.3.2.3 2008/01/04 10:37:27 jan Exp $
 *
 * Copyright 2004-2008 The Horde Project (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
 *
 * @package Text_Diff
 */

/** Text_Diff_Renderer */
require_once 'Text/Diff/Renderer.php';

/**
 * @package Text_Diff
 */
class Text_Diff_Renderer_context extends Text_Diff_Renderer {

	/**
	 * Number of leading context "lines" to preserve.
	 */
	var $_leading_context_lines = 4;

	/**
	 * Number of trailing context "lines" to preserve.
	 */
	var $_trailing_context_lines = 4;

	var $_second_block = '';

	function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
	{
		if ($xlen != 1) {
			$xbeg .= ',' . $xlen;
		}
		if ($ylen != 1) {
			$ybeg .= ',' . $ylen;
		}
		$this->_second_block = "--- $ybeg ----\n";
		return "***************\n*** $xbeg ****";
	}

	function _endBlock()
	{
		return $this->_second_block;
	}

	function _context($lines)
	{
		$this->_second_block .= $this->_lines($lines, '  ');
		return $this->_lines($lines, '  ');
	}

	function _added($lines)
	{
		$this->_second_block .= $this->_lines($lines, '+ ');
		return '';
	}

	function _deleted($lines)
	{
		return $this->_lines($lines, '- ');
	}

	function _changed($orig, $final)
	{
		$this->_second_block .= $this->_lines($final, '! ');
		return $this->_lines($orig, '! ');
	}

}
